21120022200221 has 8 divisors (see below), whose sum is σ = 24629763499200. Its totient is φ = 18102876171324.

The previous prime is 21120022200169. The next prime is 21120022200247. The reversal of 21120022200221 is 12200222002112.

It is a happy number.

It is not a de Polignac number, because 21120022200221 - 2⁶ = 21120022200157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21120022200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120022200421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30787204031 + ... + 30787204716.

It is an arithmetic number, because the mean of its divisors is an integer number (3078720437400).

Almost surely, 2^{21120022200221} is an apocalyptic number.

It is an amenable number.

21120022200221 is a deficient number, since it is larger than the sum of its proper divisors (3509741298979).

21120022200221 is an frugal number, since it uses more digits than its factorization.

21120022200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61574408768 (or 61574408754 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21120022200221 its reverse (12200222002112), we get a palindrome (33320244202333).

The spelling of 21120022200221 in words is "twenty-one trillion, one hundred twenty billion, twenty-two million, two hundred thousand, two hundred twenty-one".